Description of problem:
/etc/rc.d/init.d/messagebus checks for an existence of
/usr/bin/dbus-daemon-1 executatable. The catch is that
dbus-0.31-1 package provides /usr/bin/dbus-daemon instead.
This means that postuninstall scriptlet from 0.23-4 fails,
new messagebus does not restart, and hal it out-to-lunch.
As an apparent side effect this quietly reconfigured my
display to some "generic 800x600". Very nice!
Version-Release number of selected component (if applicable):
Fixed in dbus-0.31-2
btw hal and dbus don't have anything ot do with screen resolution.
I am not sure what is a chain of dependencies but something
definitely caused 'system-config-display' to silently run and rewrite
/etc/X11/xorg.conf in time when 'messagebus' and 'haldaemon' services
were messed up. It is hard to imagine what else could bring that.
Reboots with a sanity restored do not have such side-effects anymore.